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利用光学显微镜及X-射线衍射等测试手段对中厚板坯Q235B钢种保护渣渣膜的矿物组成、结晶率、厚度、分层结构进行了系统分析研究。结果表明,中厚板坯Q235B钢种保护渣渣膜矿物组成为镁黄长石、枪晶石、硅灰石和玻璃相。出现纵裂的事故渣膜的结晶相主要为黄长石、枪晶石,结晶率为50%~55%,呈玻璃层-结晶层-玻璃层三层结构;出现粘结漏钢现象的事故渣膜几乎全为结晶层,主要为枪晶石和硅灰石;正常渣膜结晶相以黄长石为主,结晶率为90%以上。为减少中碳钢铸坯表面纵裂及防止铸坯粘结漏钢的发生,建议提高保护渣渣膜中的结晶率,降低硅灰石的含量。
The microstructure, crystallization rate, thickness and layered structure of slag film of Q235B steel slags were systematically analyzed by optical microscopy and X-ray diffraction. The results show that the mineral composition of slag film of Q235B steel plate is Mg - Feldspar, gunite, wollastonite and glassy phase. Occurrence of vertical split of the incident crystal film of the main film for the crystallization of feldspar, gun spar, the crystallization rate of 50% to 55%, was the glass layer - crystalline layer - glass layer three-layer structure; Almost all of the crystalline layer, mainly for the gun spar and wollastonite; the normal crystalline phase of the slag film mainly to the yellow feldspar, the crystallization rate of 90%. In order to reduce the surface longitudinal cracks in the medium carbon steel slab and prevent the occurrence of the bond strand breakage, it is suggested to increase the crystallization rate in the protective slag film and reduce the wollastonite content.